tell people to install npm if they havent (#14)

Author: Edwardius

README.md

@@ -5,11 +5,15 @@ The [website](https://wiki.watonomous.ca) for the WATonomous Wiki.
 ### Getting started
 
 1. Clone the repo
-2. Install dependencies:
+1. Install npm if you haven't:
+    ```bash
+    sudo apt install npm
+    ```
+1. Install dependencies:
     ```bash
     npm install
     ```
-3. Run the development server:
+1. Run the development server:
     ```bash
     npm run dev
     ```